600D polyester - P.P. webbing. Molle compatible. Heavy duty zippers. Polyurethane coated lining and pockets for water repellency. One large main compartment with zippered pouch and mesh pocket: 17" x 8.25" x 4.25" Three additional pockets and storage compartments: 16" x 7" x 3.25" & 10" x 6.5" x 2.25" & 3.5" x 6.5" x 2.25" Adjustable padded shoulder straps. Padded back with breathable mesh backing. Top carry handle.